RyanAir has a mysterious rule about the people in the very last row in the cabin not being allowed to put their bags under the seat in front.
Presumably the idea is not to have the very last row sprawling over their bags and holding up the entire cabin during an evacuation?
I don't understand this too well, because it just would mean the last six could get out pronto, but IMHO you just have moved the problem forward one row.
People next to the emergency exits is obviously not the same situation.